Re: RT2500 Wireless knocked out by recent Kernel update.
When you say you followed the procedure in the link, may I assume it was the procedure in post #11? If so, when you did this, it built a driver module for the kernel you were running at the moment. Whenever you install a new kernel, -18 in this case, you must build a module for the new kernel. Simply boot into the new kernel, and do:
A module will be created and you may continue to configure your interface. Substitute your version of rt2500 if it's not 2008042510.
sudo make install
When -18 is superceded, repeat the process. If you are as obsessive as I am, you might download a newer version of rt2500 before you restart after the Update Manager suggests you do so. That way, you will always have the latest!
"Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.